Geographical clock



A. CAESAR. GEOGRAPHICAL CLOCK. APPLICATION FILED DEC. I6, 1920.

Patented Dec. 27, 1921.

ATTORNEY PATENT OFFICE.

AUGUST CAESAR, 0F SEATTLE, WASHINGTON.

GEOGRAPHICAL CLOCK.

To all whom it myconcem:

Be it known that I, AUGUST CAESAR, a citizen of the United States,residing at Seattle, in the county of King and State of Washington, haveinvented certain new and useful Improvements in Geographical Clocks, ofwhich the following is a specification.

This invention relates to improvements in time indicators forgeographical clocks.

The object of my invention is the provision of simple and inexpensivelyconstructed dial devices which may be conveniently used with the worksand hands of an ordinary clock to designate the time at various placesabout the world.

With this and other objects in view, as

I will appear in the following specification,

the invention consists in the novel construction, arrangement andadaptation of parts as will be hereinafter described and claimed.

' In the accompanying drawings, wherein similar reference charactersdenote like parts in the various views, Figure 1 is a front elevation ofa clock embodying the present nvention; Fig. 2 is a fragmentarysectional View taken through 2-2 of Fig. 1; and Fig. 3 is a perspectiveview of one of the clamping members for the rotary dial plate.

.In said drawings, the reference numeral 5 designates a clock casecontaining the usual or any suitable mechanism for revolving an hourhand 6 once each twelve hours and a minute hand 7 once each hour.

The hour hand 6 is carried by a tubular arbor 6 through which extendsthe arbor 7 for said minute hand. 10 represents a stationary dial,hereinafter designated as the fixed dial, having marked thereon anannular series of consecutive hour indicating numerals A 1 to 12. Aboutthe margin of said dial the same is divided into circular degrees ormultiples thereof as denoted by graduated marks B. The marks B aredenoted by numbers such as C to indicate their circular distances indegrees to 180 upon each side of an initial point D and representingmeridians east and west from said initial point or prime meridian.

Between the circle of hour indicating marks A and the marginal circledivided into meridian marks, the fixed dial 10 isprovided with acircular portion 11 in which are marked the names of selected places asChicago, Halifax, Calcutta, etc.,

Specification of Letters Patent.

Patented Dec. 27, 1921.

Application filed December 16, 1920. Serial No. 431,095.

the same being disposed upon the fixed dial radially with theircorresponding meridians with respect to a predetermined prime meridian,as for example, Greenwich which is marked opposite the ,zero point D.

In front of said fixed dial is a rotar dial 12 which, as will bepresently explained: is connected to a tubular arbor 8 which isrotatably mounted upon the hour hand arbor 6 The dial 12 and its arbor 8are rotated in unison once each twenty-four hours. As illustratedin Fig.2, a pinion 7 2 on the minute hand arbor 7 drives a gear 9 on anintermediate shaft 9 by which pinions 9 and 9 are driven to rotate gears6 and 8 on the arbors 6 and, 8 respectively.

The rotary dial 12 is of greater diameter than the diameter of thecircle of the hour indicating numerals A and is made of glass or othersuitable transparent material so that such hour numerals may be clearlyseen therethrough.

About the periphery of the rotary dial is a circle of numbers dividedinto two series, G and H, of numerals l, to 12 inclusive.

In proximity of the respective numbers 12 of such series the rotary dialis provided with the words Noon and Midnight, and medially thereof atdiametrically opposite sides are rovided the words Evening and orning.The above referred to numbers and words are most advantageously appliedto the rotary dial by pasting to the back surface of the dial a paperring upon which they are printed.

The manner of connecting the rotary dial 12 toits arbor 8 is an imortant feature of the present invention. fieferring to Fig. 2, 13represents a sleeve which surrounds the arbor 8 and extends {throu hcenter holes provided in both of said ials. At its outer end said sleeveis provided with a circular flange 14 serving as a head and betweenwhich and the front surface of the rotary dial is desirably placed athin washer 15 of felt or an equivalent. The inner end of the sleeve 13is provided with a plurallt of longitudinally disposed slot 16 (Fig. 33to afford intermediate fingers 17 whereby the arbor 8 is grasped about aperipheral shoulder 18 thereof. I

Seated against the rear surface of the rotary dial 811d opposed relationto the 11('- sleeve flange 14: is a recessed washer 19 of les diameterthan the hole 20 in the fixed dial. The recess of the washer 19 servesto receive one end of a helical spring 21 surrounding said sleeve, andthe other end of the spring bears against a collar 22 which is securedby a set screw 23 to the sleeve.

The spring 21 acts to retain the rotary dial out of contact with thefixed dial 10 and causes the rotary dial to be frictionally engagedbetween the flange 14: and the washer 19 which with the sleeve 13 arerotated in unison with the arbor 8 every twenty-four hours.

The rotary dial may be adjusted by turning the same independently of thearbor 8 to bring the number in series G or H (according to whether it isafternoon or before noon) which correspond with the actual time(indicated by the clock hands 6 and 7 with respect to the numerals A ofthe fixed dial) opposite the name in circle 11, of the place where theclock is used. For instance, assuming the clock is to be employed atSeattle, say at three oclock a. m., the rotary dial is adjusted by beingindependently rotated to present the correspondingly designated mark 3of the eries H into proximity of the word Seattle.

Bein thus set, the coincident time at any other p ace which is marked incircle 11, or whose longitude is known with respect to the primemeridian, is ascertained by comparing its position in circle 11 with theperipheral number in G or H upon the rotary dial.

After the rotary dial is adjusted it turns with the arbor 8 to point offin an interesting way the passage of time at various place throughoutthe world.

What I claim, is,

1. In a clock having clock hands and a ing aid numbers and containingselected place names, a rotary dial formed of transparent materialthrough which all of said numbers are coincidently visible, said rotarydial having at its periphery two sets of time indicating numbers rangingfrom 1 to 12, an arbor for rotating said rotary dial once eachtwenty-four hours for indicating by the numbers thereon concurrent timewith respect to the places designated by said names and spring actuatedmeans for yieldingly engaging said rotary dial to the arbor therefor.

2. In a clock, the combination with a nonrotary dial provided upon itsface with characters to indicate the names of places and degrees oflongitude, the clock hands, and arbors therefor, of a rotary dialprovided circumferentially with time indicating characters', an arborfor said rotary dial, means to connect said rotary dial to the arborthereof for independent and unitary rotary movements, said meanscomprising a sleeve secured to the arbor and having a head element infront of the rotary dial, a washer mounted upon said sleeve at the backof the rotary dial, a spring acting against said washer to frictionallyengage the rotary dial with the sleeve head, and means for regulatingthe efiective power of the spring.

Signed at Seattle Washington, this 7th day of December 1920.

AUGUSTCAESAR.

Witnesses:

PIERRE BARNES, MARGARET G. TUPPLE.

